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DIE FORSTRIKING UP BRACELET STOCK.

No. 252,676. Patented Jan. 24,1882.

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PKELLER &'0. PREY;

- .1315 FOR STRIKING UP BRACELET STOCK.

No. 252,676. Patented Jan. 24,1882.

WITNESSES NM. Rum-SW.

mm STAT S ATENT which.

DIE FQR STRIKING UP BRACELET-STOCK.

SPECIFICATION forming part of Letters Patent No, 252,676, dated January 24, 1862.

Application filed June 25, 1881. (No model.)

To all whom it may concern I Be it known that we, FRANK KELLER and CHARLES FREY, of thecity, county, and State of New York, have invented certain newand useful Improvements in Dies for Striking Up Corrugated Strips, of which the following is a specification.

This invention relates to an improved die for striking up gold or other metallic strips with corrugations upon both sides, to be used for ornamental purposes in the manufacture of jewelry; and the invention consists of a lower die-section having a corrugated middle portion, a guide-shoulder back of the same, and guide-pins back of the shoulder, in combination with an upper die-section having a corrugated middle portion and a recess back of the same, and socket-holes for the guide-pins back of the recess.

In the accompanying drawings, Figure 1 represents a front view; Fig. 2,.a vertical ti ansverse section ot'ourimproved die. for striking up corrugated strips. Figs. 3 and at are respectively a top view and a bottom view of the lower and upper die-sections. Fig. 5 is a perspective view of a corrugated strip struck up by an improved die. Fig.6 is a front view of the dieqon an enlarged scale, showing the diminishing concavity of the seats; and Fig. 7 is an enlarged perspective view of astrip after the first blow.

Similar letters of reference indicate correspondin g parts.

A in the drawings represents the lower and B the upper section of our improved die for striking np corrugated strips of gold-or other metal. The lower die-section, A, is provided with a raised central portion, a, that is corrugated at its upper surface. Immediately hack of the corrugated portion a is arranged an upwardlyextending guide-shoulder, b, of greater height than the portion a, and back of the same two upright guide-pins,d. I

The upper die-section, B, is arranged with a corrugated portion, a, which is an exact counterpart of the lower corrugated portion, a. Back of the corrugated portion a is arranged a guide-recess, b, of less depth than the height of the shoulder Z) of the lower section, A, so that the upper die-section, B, in its downward motion, is stopped by the shoulder and permitted to descend 'only far enough so thatits corrugated portion a is retained at; a certain fixed distance from the corrugated portion a of the lower die-section, A.. The upper diesection, B, has, furthermore, back of the recess I), socket-holes d, which register with the guide-pins d of the lower die-section, so as to prevent the lateral displacementof the upper die-section and secure the perfect registering of the corrugated portions one vertically above the other.

The corrugations of the die-sections are not made equal in size with each other, but are so arranged as to'inerease gradually in concavity from one end of the die-sections to the other whiledecreasing in width, as shown clearly in Figs. 5 and 7.

The fiatstrip of gold to he corrugated is introduced at that side of the diesections at which the corrugations are less concave,'but wider, and inserted for the length of one corrugation. A blow is then given by the upper die, whereby one corrugation is formed on the strip. The strip is now advanced for the dis tance of one corrugation, so that the second stroke forms a second corrugation next to the first one, while the first corrugation receives a more convex form. This is continued all through the die seetions until each completed corrugation has received a separate stroke while placed under each of the successiveconcavities of the die-sections, so that finally corrugations of uniform width and convexity are produced. I

In this manner gold strips with ribs or corrugations of uniform size are obtainedquicker and at less expense than when made by hand, to be then applied for ornamental purposes in the manufacture of jewelry.

Having thus described our invention, we claim as new and desire to-secure by Letters Patent- 1'. The combination of the lower diesection, A, having a central raised and corrugated portion, a, a vertical guideshoulder, I), back of the same, and guide-pins cl, with an upper diesection, B, having a corrugated portion, a, a recess, 1), of less depth than the guide-shoulder I), back ofthe corrugated portion a, and socketholes d, vertically above the guide-pins d, all

In testimony that we claim the foregoing as our invention we have signed our names, in presence of two witnesses, this 22d day of 15 June, 1881.

arranged suhstantiall5 as and for the purpose set forth.

2. As an improvement in dies for striking up corrugated strips, a lower die-section, A, having a raised corrugated portion, a, and anupper diesectio|1,B, having corrugated portion a, the corrugations of the partsa a diminishing gradually in width while increasing in height from one end to the other of the dies, in combination with guide and stop devices, by which the motion of the upper die is controlled, substantially as set forth.

FRAN K KELLER. CHARLES FREY.

Witnesses:

i JosEPn KELLER, Jr. 

